Super oxygenation breathing (25-30 cycles) can deploy adrenaline for focus but may cause anxiety and is not recommended for those prone to panic attacks.

“a couple of those tools might be the what we called super oxygenation breathing which I admit is not always super oxygenating. So this would be if didn't want it to consume anything. This could be 25 or 30 cycles of in deep inhales and exhales. It's likely to create some anxiety and a low level stress. If you're someone who's prone to panic attacks I wouldn't recommend this, but it's pretty straight forward. It will deploy adrenaline into your system. And you will find that your visual field is focused and you will be able to work and focus better than if you just kinda waited around for some wave of motivation to wash over you.”